Continuity mistake: After Belle says good morning to Jean Potts, when she feeds the apple to the donkey note the rope (crosstie) is tied off at the donkey's throat, but in the next closeup the rope is tied off directly to the halter knot at its cheek.
Continuity mistake: When Belle finds her father locked up she's holding her stick with one hand, then the angle changes and she's using both. We switch back and she's using one hand again.
Continuity mistake: When Gaston and Le Fou approach the village on horseback, they watch Belle through a telescope. In the shot from behind, Le Fou has to stretch out to reach the telescope when Gaston passes it across and his fingers barely touch the end of it, but when the view changes to the front the horses are closer together and he is holding the telescope firmly in the middle.
Continuity mistake: When Belle exits her house singing, in the front shot the building to the right in in shadow. The angle changes and it's suddenly much brighter.
Continuity mistake: When Le Fou enters the castle, he's holding a torch to his left - angle changes and it's suddenly to his right. The angle changes back, and it's back on the left again.
Answer: She didn't have to, the second Belle proclaimed her love for the Beast, the spell was broken. She would have seen her use her magic to reverse the curse. It would be obvious to everyone she was an enchanted being.